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• This set of wells was completed in 1989, and samplers/pressure transducers <br />installed in Feb./March of 1990. Therefore, data was obtained prior to ground <br />water pumpage (water well 90-1 ), and 1991 mining activities. See Table 6-2 for <br />summary of October, 1990 -September, 1991 water quality data. <br />The water quality 1W.O.) results for wells immediately down-gradient from <br />injection/production well field indicate three distinct water quality zones. The <br />Perched aquifer is low in TDS (Total Dissolved Solids-, conductivity, fluoride, SAR <br />(Sodium Absorption Ratio) and moderate to high in pH. The A and B-Groove <br />aquifers are similar in water quality with moderate TDS, conductivity, SAR, but <br />high fluoride and pH. Although similar, the B-Groove aquifer generally has slightly <br />higher levels of TDS, conductivity, SAR and fluoride. The Dissolution Surface <br />aquifer is characterized by high TDS, conductivity, SAR, magnesium, potassium <br />• but moderate fluoride and pH. No trend or significant water quality change was <br />noted, therefore through the 1991 water year, no effects from NaTec's activities <br />were evident. <br />Water level data from baseline condition prior to pumpage or injection, indicated <br />four distinct zones. See Figure 6-2 for "baseline", April, 1990 water levels. <br />Pumping from NaTec's water well, 90-1 completed in the A-Groove, began in <br />May, 1990 and effected primarily the A-Groove and to a lesser degree, the B- <br />Groove aquifer. See Figure 6-3 from April, 1991 for illustration of pumpage <br />effects and Figure 6-4 from October, 1991 for an example of potentiometric water <br />level recovery following several months of no pumpage and after injection/solution <br />mining activity was temporarily suspended. <br /> <br />51 <br />